arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1206.4517math.CO
收藏

素有限域上关联和Beck型界的进一步改进

Further improvements to incidence and Beck-type bounds over prime finite fields

Timothy G. F. Jones

摘要:

建立了改进的有限域Szemeredi-Trotter和Beck型定理。首先证明了如果P和L分别是平面F_p^2上的点集和直线集,且|P|,|L| \leq N和N<p,则P中的点与L中的直线之间至多有C_1 N^{3/2-1/662+o(1)}个关联。这里C_1是大于1的某个绝对常数。这改进了以前最著名的C_1 N^{3/2-1/806+o(1)}的界。其次,证明了如果P是\mathbb{F}_p^2中的点集,且|P| <p,则P中至少有C_2 |P| ^{1-o(1)}个点包含在一条直线中,或者P确定至少C_2 |P| ^{1+1/109-o(1)}条不同的直线。这里C_2是一个小于1的绝对常数。这在两个方面改进了以前的结果。从数量上来说,1+1/109-o(1)的指数比以前最著名的1+1/267指数更强。定性地说,这个结果适用于满足基数条件的F_p^2的所有子集;以前最著名的结果只适用于当P的形式为P=A*A时,A \subseteq F_p。

英文摘要:

We establish improved finite field Szemeredi-Trotter and Beck type theorems. First we show that if P and L are a set of points and lines respectively in the plane F_p^2, with |P|,|L| \leq N and N<p, then there are at most C_1 N^{3/2-1/662+o(1)} incidences between points in P and lines in L. Here C_1 is some absolute constant greater than 1. This improves on the previously best-known bound of C_1 N^{3/2-1/806+o(1)}. Second we show that if P is a set of points in \mathbb{F}_p^2 with |P|<p then either at least C_2|P|^{1-o(1)} points in P are contained in a single line, or P determines least C_2 |P|^{1+1/109-o(1)} distinct lines. Here C_2 is an absolute constant less than 1. This improves on previous results in two ways. Quantitatively, the exponent of 1+1/109-o(1) is stronger than the previously best-known exponent of 1+1/267. And qualitatively, the result applies to all subsets of F_p^2 satisfying the cardinality condition; the previously best-known result applies only when P is of the form P=A*A for A \subseteq F_p.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑